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revenue from contracts with customers - Contract assets (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Contract assets
Contract assets at beginning of period	$ 913	$ 867	$ 939	$ 898
Net additions arising from operations	370	375	748	728
Amounts billed in the period and thus reclassified to accounts receivable	(421)	(399)	(830)	(789)
Change in impairment allowance, net	(1)	(1)	4	4
Other	1	1	1	2
Contract assets at end of period	862	843	862	843
Reconciliation of contract assets presented in the Consolidated statements of financial position - current
Gross contract assets	589	564	589	564
Reclassification to contract liabilities of contracts with contract assets less than contract liabilities	(17)	(15)	(17)	(15)
Reclassification from contract liabilities of contracts with contract liabilities less than contract assets	(119)	(127)	(119)	(127)
Current contract assets	$ 453	$ 422	$ 453	$ 422	$ 465

X

- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_105&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 116
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ContractAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_ContractAssetsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of current contract assets. [Refer: Contract assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_105&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_CurrentContractAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of current contract assets before reclassifications into and out of contract liabilities.

+ References

No definition available.

+ Details

Name:	tu_CurrentContractAssetsBeforeReclassificationIntoOutOfContractLiabilities
Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The decrease in contract assets resulting from reclassification to accounts receivable.

+ References

No definition available.

+ Details

Name:	tu_DecreaseThroughReclassifiedToAccountsReceivableContractAssets
Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The increase (decrease) in contract assets resulting from other activities.

+ References

No definition available.

+ Details

Name:	tu_IncreaseDecreaseContractAssetsOther
Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Increase (decrease) in impairment allowance for credit losses of financial assets.

+ References

No definition available.

+ Details

Name:	tu_IncreaseDecreaseInFinancialAssetsImpairmentAllowanceNet
Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The increase in contract assets resulting from operational activities during the period.

+ References

No definition available.

+ Details

Name:	tu_IncreaseThroughOperationsContractAssets
Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Reclassification from contract liabilities for contracts with contract liabilities less than contract assets.

+ References

No definition available.

+ Details

Name:	tu_ReclassificationFromContractLiabilitiesForContractsWithContractLiabilitiesLessThanContractAssets
Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Reclassification of current contract assets to contract liabilities for contracts with contract assets less than contract liabilities.

+ References

No definition available.

+ Details

Name:	tu_ReclassificationToContractLiabilitiesForContractsWithContractAssetsLessThanContractLiabilities
Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	tu_ReconciliationOfContractAssetsCurrentAbstract
Namespace Prefix:	tu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration